JPH09263458A - Finned ceramic tube and its production - Google Patents
Finned ceramic tube and its productionInfo
- Publication number
- JPH09263458A JPH09263458A JP7697296A JP7697296A JPH09263458A JP H09263458 A JPH09263458 A JP H09263458A JP 7697296 A JP7697296 A JP 7697296A JP 7697296 A JP7697296 A JP 7697296A JP H09263458 A JPH09263458 A JP H09263458A
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- Prior art keywords
- fins
- tubular body
- firing
- fin
- ceramic
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、主としてセラミッ
クス製多管式熱交換器の伝熱管として使用されるフィン
付きのセラミックス管に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a finned ceramic tube mainly used as a heat transfer tube for a ceramic multitubular heat exchanger.
【０００２】[0002]
【従来の技術】現在、高効率、低公害、燃料の多様化等
を目的とした先進型セラミックガスタービンの研究開発
が、国家プロジェクトとして実施されている。そして、
このセラミックガスタービンの要素機器の一つとして、
従来の金属材料に代えて、耐熱高温材料として優れた性
能を有するセラミック材料を用いた熱交換器の開発が行
われている。このようなセラミックス製の熱交換器の代
表的なものとして、伝熱管を多数束ねて伝熱管群を構成
した多管式熱交換器が知られている。この多管式熱交換
器の伝熱管には、図６に示すようなセラミックス管１４
が用いられている。2. Description of the Related Art Currently, research and development of advanced ceramic gas turbines for the purpose of high efficiency, low pollution, diversification of fuel, etc. are being carried out as a national project. And
As one of the component equipment of this ceramic gas turbine,
A heat exchanger using a ceramic material having excellent performance as a heat resistant high temperature material has been developed in place of the conventional metal material. As a typical example of such a heat exchanger made of ceramics, a multi-tube heat exchanger in which a large number of heat transfer tubes are bundled to form a heat transfer tube group is known. The heat transfer tube of this multi-tube heat exchanger includes a ceramic tube 14 as shown in FIG.
Is used.
【０００３】[0003]
【発明が解決しようとする課題】ところで、熱交換器に
おいては、その熱交換効率の向上が最も重要な技術課題
となっている。金属製の多管式熱交換器では、熱交換効
率向上のための有効な手段の１つとして、伝熱管の外面
にフィンを形成して伝熱面積を拡大させることが行われ
ている。しかしながら、セラミックス製の伝熱管は、主
として押し出し成形法により作製されるためにその外周
形状が限定されることや、セラミック材の加工の困難さ
等の理由からフィン付きの伝熱管は使用されていなかっ
た。本発明は、このような事情に鑑みてなされたもので
あり、主にセラミックス製多管式熱交換器の伝熱管とし
て使用可能なフィン付きのセラミックス管とその製造方
法を提供することを目的とする。By the way, in the heat exchanger, improvement of the heat exchange efficiency is the most important technical problem. In a metal multitubular heat exchanger, fins are formed on the outer surface of the heat transfer tube to expand the heat transfer area as one of effective means for improving heat exchange efficiency. However, since heat transfer tubes made of ceramics are mainly produced by extrusion molding, their outer peripheral shape is limited, and heat transfer tubes with fins are not used because of the difficulty of processing ceramic materials. It was The present invention has been made in view of such circumstances, and an object thereof is to provide a ceramic tube with fins that can be mainly used as a heat transfer tube of a ceramic multi-tube heat exchanger, and a manufacturing method thereof. To do.
【０００４】[0004]
【課題を解決するための手段】本発明によれば、セラミ
ックス焼結体からなる管状体に、セラミックス未焼結体
からなり、前記管状体を挿通するための貫通孔を有する
リング状のフィンを、所定の間隔で多数装着し、これを
焼成することにより前記管状体とフィンとの焼成収縮率
の差を利用して、前記管状体とフィンとを一体に接合固
定してなることを特徴とするフィン付きセラミックス管
の製造方法、が提供される。According to the present invention, a ring-shaped fin made of a ceramics unsintered body and having a through hole for inserting the tubular body is provided in a tubular body made of a ceramics sintered body. A plurality of them are attached at a predetermined interval, and by firing them, the tubular body and the fins are integrally joined and fixed by utilizing the difference in firing shrinkage between the tubular body and the fins. A method of manufacturing a ceramic tube with fins is provided.
【０００５】また、本発明によれば、セラミックスから
なる管状体に、セラミックスからなるリング状のフィン
が接合固定されていることを特徴とするフィン付きセラ
ミックス管、が提供される。Further, according to the present invention, there is provided a finned ceramics tube characterized in that a ring-shaped fin made of ceramics is joined and fixed to a tubular body made of ceramics.
【０００６】なお、本発明において、「セラミックス未
焼結体」とは、セラミックスの成形体（生素地）又は仮
焼体（仮焼素地）を意味する。In the present invention, the "ceramic unsintered body" means a ceramic molded body (green body) or a calcined body (calcined body).
【０００７】[0007]
【発明の実施の形態】上記のように本発明の製造方法
は、管状体とフィンとの焼成収縮率の差を利用して両者
を一体化するものである。すなわち、既に焼結を完了
し、それ以上焼成してもほとんど焼成収縮しない管状体
に、未焼結状態で焼成により大きな焼成収縮を示すリン
グ状のフィンを装着して焼成を行う。このような状態で
焼成を実施すると、フィンの焼成収縮により、管状体が
挿通された貫通孔部において、フィンが管状体を締めつ
ける状態となり両者が一体に接合固定される。BEST MODE FOR CARRYING OUT THE INVENTION As described above, the manufacturing method of the present invention utilizes the difference in the firing shrinkage between the tubular body and the fins to integrate them. That is, firing is performed by attaching a ring-shaped fin, which shows a large firing shrinkage by firing in an unsintered state, to a tubular body which has already been sintered and which hardly shrinks even if further fired. When firing is performed in such a state, the fin contracts the tubular body in the through-hole portion where the tubular body is inserted due to the shrinkage of the firing of the fin, and both are integrally joined and fixed.
【０００８】以下、本発明を図面を参照しながら詳しく
説明する。図１は、本発明の製造方法の一例を示す説明
図である。図中、６は焼成用の枠体であり、対向する二
つの枠構成面６ａ、６ｂには管状体２を支持するための
溝８が形成されている。また、他の対向する二つの枠構
成面６ｃ、６ｄには、管状体２に装着した各フィン４を
所定の間隔で位置決めするためのスペーサー棒１２を支
持する溝１０が形成されている。The present invention will be described below in detail with reference to the drawings. FIG. 1 is an explanatory view showing an example of the manufacturing method of the present invention. In the figure, 6 is a frame for firing, and a groove 8 for supporting the tubular body 2 is formed on two opposing frame constituting surfaces 6a, 6b. Grooves 10 for supporting spacer rods 12 for positioning the fins 4 mounted on the tubular body 2 at predetermined intervals are formed on the other two opposing frame constituting surfaces 6c and 6d.
【０００９】このような枠体６を用い、まず、枠体６の
枠構成面６ｃ、６ｄに所定間隔で形成された溝１０のそ
れぞれにスペーサー棒１２を架け渡し、スペーサー棒１
２が所定の間隔で平行に並んだ状態とする。次いで、フ
ィン４の貫通孔に管状体２を挿通して、管状体２に必要
枚数のフィン４を装着した後、この管状体２を端部が枠
構成面６ａ、６ｂの溝８に支持されるように枠体６に架
け渡す。Using such a frame body 6, first, a spacer rod 12 is bridged over each of the grooves 10 formed at predetermined intervals on the frame constituting surfaces 6c and 6d of the frame body 6, and the spacer rod 1
Two are arranged in parallel at a predetermined interval. Next, after inserting the tubular body 2 into the through holes of the fins 4 and mounting the required number of fins 4 on the tubular body 2, the ends of the tubular body 2 are supported by the grooves 8 of the frame constituting surfaces 6a and 6b. So that it can be laid over the frame 6.
【００１０】このとき、管状体２に装着したフィン４
が、平行に並んだ各スペーサー棒１２の間に、一枚づつ
その一部が収まるようにフィン４の位置を調整する。こ
うして、図のように管状体２にフィン４が所定の間隔で
装着された状態とし、この状態で焼成を行う。この焼成
によって、上述したように管状体２とフィン４とが、両
者の焼成収縮率の差によって一体化する。At this time, the fins 4 attached to the tubular body 2
However, the position of the fins 4 is adjusted so that a part of each of the spacer rods 12 arranged in parallel can be accommodated one by one. Thus, as shown in the figure, the fins 4 are attached to the tubular body 2 at predetermined intervals, and firing is performed in this state. By this firing, as described above, the tubular body 2 and the fins 4 are integrated due to the difference in firing shrinkage between the two.
【００１１】なお、本発明において、フィンの外周形状
には特に限定はなく、フィンの一例を示した図３の平面
図(ａ)のような円形のもののみならず、他の形状、例え
ば多角形であってもよい。また、フィンの断面形状にも
特に限定はなく、図３の断面図(ｂ)のようなフィン４全
体の厚みが均一なものでもよいし、図４のように外周に
近づくにしたがって徐々にフィン４の厚みが薄くなるよ
うにしたものでもよい。また、図５のようにフィン４の
外周部に丸みを持たせてもよく、こうすることにより、
フィン先端部の欠けを防ぐ効果が得られる。In the present invention, the shape of the outer circumference of the fin is not particularly limited, and it is not limited to the circular shape as shown in the plan view (a) of FIG. It may be prismatic. Also, the cross-sectional shape of the fin is not particularly limited, and the fin 4 may have a uniform thickness as shown in the cross-sectional view (b) of FIG. 3, or the fin may gradually become closer to the outer periphery as shown in FIG. The thickness of 4 may be thin. Further, as shown in FIG. 5, the outer peripheral portion of the fin 4 may be rounded, and by doing so,
The effect of preventing chipping of the fin tips can be obtained.
【００１２】ただし、フィン４の幅（＝（外径−貫通孔
径）／２）をＡとし、管状体と接する部分（貫通孔形成
部分）のフィン４の厚みをＢとしたときに、これらの比
Ａ／Ｂが８０以上となるような形状のフィンを用いる
と、接合の過程でフィンに変形を生じやすいので、この
比の値が８０未満となるような形状とすることが好まし
い。However, when the width of the fin 4 (= (outer diameter-through hole diameter) / 2) is A and the thickness of the fin 4 at the portion contacting the tubular body (through hole forming portion) is B, these If a fin having a shape with a ratio A / B of 80 or more is used, the fin is likely to be deformed in the process of joining. Therefore, it is preferable that the shape of the ratio is less than 80.
【００１３】また、本発明の製造方法において管状体と
フィンとの良好な接合状態を得るためには、下式により
示される締め代の値が０より大きく、１．５mmより小さ
くなるようにすることが好ましい。Further, in order to obtain a good joint state between the tubular body and the fins in the manufacturing method of the present invention, the interference value represented by the following formula is set to be larger than 0 and smaller than 1.5 mm. It is preferable.
【００１４】[0014]
【数２】 （式中、「フィンの焼成割掛け」とは、貫通孔に何も挿
通せず、焼成収縮が拘束無く進行する状態でフィンを焼
成した場合において、フィンの焼成前の寸法を焼成後の
寸法で除した値をいう。）[Equation 2] (In the formula, "firing firing of fins" means that the fins before firing are the dimensions after firing when the fins are fired in a state where nothing is inserted into the through hole and firing shrinkage proceeds without restriction. The value divided by.)
【００１５】この締め代の値が０以下の場合（０又はマ
イナスの値をとる場合）には、焼成しても管状体とフィ
ンとの接合状態が得られず、一方、１．５mm以上の場合
には接合過程でフィンが割れやすい。When the value of this interference is 0 or less (when it is 0 or a negative value), the joining state between the tubular body and the fin cannot be obtained even by firing, while it is 1.5 mm or more. In this case, the fins are easily broken during the joining process.
【００１６】なお、管状体やフィンの外周形状や内周形
状（孔形状）が円以外の形状、例えば多角形である場
合、「管状体外径」、「フィンの外径」、「フィンの貫
通孔径（内径）」とは、それぞれの外周形状や内周形状
に内接する円の直径をいうものとする。When the outer peripheral shape or inner peripheral shape (hole shape) of the tubular body or fins is a shape other than a circle, for example, a polygonal shape, "tubular body outer diameter", "fin outer diameter", "fin penetration" The "hole diameter (inner diameter)" means the diameter of a circle inscribed in each outer peripheral shape or inner peripheral shape.
【００１７】図２に上記のようして得られたフィン付き
セラミックス管の一例を示す。このセラミックス管は、
セラミックスからなる管状体２に、セラミックスからな
るリング状のフィン４が接合固定されたものである。こ
のセラミックス管では、管状体２に接合されたフィン４
によって、管外面の面積が拡大されているので、これを
多管式熱交換器の伝熱管に用いると、フィンの無い伝熱
管に比べて大きな伝熱面積が得られ、この結果、熱伝達
率が向上して、高い熱交換効率が得られる。FIG. 2 shows an example of the finned ceramic tube obtained as described above. This ceramic tube is
A ring-shaped fin 4 made of ceramics is bonded and fixed to a tubular body 2 made of ceramics. In this ceramic tube, the fins 4 joined to the tubular body 2
Since the area of the outer surface of the tube is expanded by using this, when this is used for the heat transfer tube of the multi-tube heat exchanger, a larger heat transfer area is obtained compared to the heat transfer tube without fins, and as a result, the heat transfer coefficient Is improved and high heat exchange efficiency is obtained.
【００１８】上記のように、本発明のフィン付きセラミ
ックス管は、その主な用途としてセラミックス製多管式
熱交換器の伝熱管が挙げられるが、伝熱管以外にもこの
ような構造体が利用できる他の用途に使用してもよい。As described above, the finned ceramics tube of the present invention is mainly used as a heat transfer tube of a ceramic multi-tube heat exchanger, but such a structure is used in addition to the heat transfer tube. It may be used for other possible applications.
【００１９】本発明に使用されるセラミックスとして
は、特に限定はないが、高強度・高耐熱性の窒化珪素や
炭化珪素が好適に用いられる。管状体とフィンとは同種
のセラミックスで作製してもよいし、それぞれ異種のセ
ラミックスで作製してもよい。例えば、管状体を窒化珪
素で作製し、フィンをより熱伝導率の高い窒化アルミニ
ウムで作製することができる。The ceramic used in the present invention is not particularly limited, but high strength and high heat resistance silicon nitride or silicon carbide is preferably used. The tubular body and the fins may be made of the same kind of ceramics, or may be made of different kinds of ceramics. For example, the tubular body can be made of silicon nitride and the fin can be made of aluminum nitride, which has a higher thermal conductivity.
【００２０】[0020]
【実施例】以下、本発明を実施例に基づいて更に詳細に
説明するが、本発明はこれらの実施例に限定されるもの
ではない。EXAMPLES Hereinafter, the present invention will be described in more detail with reference to examples, but the present invention is not limited to these examples.
【００２１】〔実施例１〕：Ｓｉ3Ｎ4粉末１０００ｇ
に、焼結助剤としてＹ2Ｏ3 １０ｇ、ＭｇＯ １０ｇ、Ｚ
ｒＯ2 ５ｇ、有機バインダーとしてポリビニルアルコー
ル１ｇを添加し、更に水１０００ｇを加え、Ｓｉ3Ｎ4玉
石（φ５mm）を用いてアトライタにより４時間粉砕・混
合を行った。得られた微粉砕混合物を、スプレードライ
ヤーによって乾燥・造粒して得た粉末を原料として、押
出成形により管状の成形体を作製し、１１０℃で１０時
間乾燥させた。乾燥後５００℃で５時間バインダー仮焼
を行い、更に１６５０℃で１時間焼成して、外径８mm、
内径６mm、長さ２００mmの管状体（焼結体）を得た。Example 1 1000 g of Si 3 N 4 powder
A, Y 2 O 3 10g as a sintering aid, MgO 10 g, Z
5 g of rO 2 and 1 g of polyvinyl alcohol as an organic binder were added, 1000 g of water was further added, and pulverization and mixing were carried out for 4 hours using an Si 3 N 4 boulder (φ5 mm) with an attritor. The obtained finely pulverized mixture was dried and granulated by a spray drier, and a powder was obtained as a raw material, a tubular molded body was produced by extrusion molding, and dried at 110 ° C. for 10 hours. After drying, the binder is calcined at 500 ° C for 5 hours, and then at 1650 ° C for 1 hour to obtain an outer diameter of 8 mm,
A tubular body (sintered body) having an inner diameter of 6 mm and a length of 200 mm was obtained.
【００２２】また、管状体の作製に用いたものと同じ原
料を用い、静水圧プレス成形により、７ton/cm2の圧力
を加えてリング状の成形体を作製した。これを上記管状
体の作製におけると同様の条件で乾燥及びバインダー仮
焼し、その後、窒素雰囲気中１３５０℃で３時間仮焼を
行った。こうして後述の焼成後におけるフィンの幅がそ
れぞれ１２mm、２４mm、４８mmとなるような３種類のリ
ング状フィン（仮焼体）を得た（フィンの厚みはすべて
２mm）。Further, using the same raw material as that used for producing the tubular body, a ring-shaped formed body was produced by applying a pressure of 7 ton / cm 2 by isostatic pressing. This was dried and binder calcined under the same conditions as in the production of the tubular body, and then calcined at 1350 ° C. for 3 hours in a nitrogen atmosphere. In this way, three types of ring-shaped fins (calcined body) were obtained, the fins of which had a width of 12 mm, 24 mm, and 48 mm after firing, respectively (fin thicknesses were all 2 mm).
【００２３】得られた管状体とフィンを用い、図１に示
すような上述の枠体を用いた方法にて、管状体にフィン
を８mm間隔で装着し、その状態で窒素雰囲気中１６５０
℃で３時間焼成した。こうして、管状体とフィンとを一
体に接合し、フィンの幅が異なる３種類のフィン付きセ
ラミックス管を得た。なお、この焼成よる接合において
締め代の値はすべて０．５mmとした。また、比較として
フィンを接合しないセラミックス管（管状体のみのも
の）を用意し、フィン付きセラミックス管とともに熱伝
達率の測定に供した。Using the obtained tubular body and fins, the fins were attached to the tubular body at intervals of 8 mm by the method using the above-described frame body as shown in FIG. 1, and in that state 1650 in a nitrogen atmosphere.
Calcination was performed at 3 ° C. for 3 hours. In this way, the tubular body and the fins were joined together to obtain three types of finned ceramic tubes having different fin widths. In addition, in this joining by firing, the value of the interference was all 0.5 mm. For comparison, a ceramic tube without fins (a tubular body only) was prepared and subjected to measurement of heat transfer coefficient together with the finned ceramic tube.
【００２４】熱伝達率は、一定流量の空気気流中に、管
内部をコイルヒーターで加熱したセラミックス管を配置
し、空気温度と管表面の温度とを測定して求めた。この
結果を、フィンの無いセラミックス管の熱伝達率を１０
０％として表１に示した。表１に示す結果から、リング
状フィンを形成することにより、熱伝達率が大幅に向上
することがわかる。The heat transfer coefficient was determined by arranging a ceramic tube whose inside was heated by a coil heater in an air flow of a constant flow rate and measuring the air temperature and the temperature of the tube surface. This result shows that the heat transfer coefficient of a ceramic tube without fins is 10
It was shown in Table 1 as 0%. From the results shown in Table 1, it is understood that the heat transfer coefficient is significantly improved by forming the ring-shaped fin.
【００２５】[0025]
【表１】 [Table 1]
【００２６】〔実施例２〕：上記実施例１と同様にして
管状体（焼結体）を作製し、また、実施例１のフィンの
作製方法に準じて外径が２０mmで、締め代が表２に示す
値になるように貫通孔径（内径）を調整した種々のリン
グ状フィン（仮焼体）を作製した。次いで、実施例１と
同様に管状体にフィンを装着して焼成を行い、焼成後、
管状体とフィンとの接合状態を調べた。その結果は表２
に示すとおりであり、締め代が０mm以下の場合及び１．
５mm以上の場合には接合不良やフィン割れが生じ、締め
代が前記以外の範囲にある場合に良好な接合状態が得ら
れた。[Example 2]: A tubular body (sintered body) was produced in the same manner as in Example 1, and the outer diameter was 20 mm and the interference was according to the method for producing the fin of Example 1. Various ring-shaped fins (calcined bodies) in which the through-hole diameters (inner diameters) were adjusted to the values shown in Table 2 were produced. Then, fins are attached to the tubular body and firing is performed in the same manner as in Example 1, and after firing,
The joining state between the tubular body and the fin was examined. The results are shown in Table 2.
When the tightening margin is 0 mm or less, and 1.
When it is 5 mm or more, poor joining and fin cracking occur, and when the tightening margin is in the range other than the above, a good joining state was obtained.
【００２７】[0027]
【表２】 [Table 2]
【００２８】〔実施例３〕：上記実施例１と同様にして
管状体（焼結体）を作製し、また、実施例１のフィンの
作製方法に準じて後述の焼成後におけるフィンの幅とフ
ィンの厚みとの関係が表３のようになるような種々のリ
ング状フィン（仮焼体）を作製した。次いで、実施例１
と同様に管状体にフィンを装着して焼成を行い、焼成
後、管状体とフィンとの接合状態を調べた。その結果は
表３に示すとおりであり、フィンの幅（Ａ）とフィンの
厚み（Ｂ）との比（Ａ／Ｂ）が８０以上の場合にはフィ
ンに変形が生じ、８０より小さい場合に良好な接合状態
が得られた。[Example 3]: A tubular body (sintered body) was produced in the same manner as in Example 1 above, and the fin width after firing, which will be described later, was obtained according to the fin producing method of Example 1. Various ring-shaped fins (calcined bodies) having the relationship with the thickness of the fins as shown in Table 3 were prepared. Then, Example 1
Similarly to the above, a fin was attached to the tubular body to perform firing, and after firing, the joining state between the tubular body and the fin was examined. The results are shown in Table 3. When the ratio (A / B) of the fin width (A) to the fin thickness (B) is 80 or more, the fin is deformed, and when the ratio is less than 80. A good joining state was obtained.
【００２９】[0029]
【表３】 [Table 3]
【００３０】[0030]
【発明の効果】以上説明したように、本発明の製造方法
は、セラミックス焼結体である管状体と、セラミックス
未焼結体であるフィンとを組み合わせて焼成し、両者の
焼成収縮率の差を利用して接合一体化するものである。
本製造方法によれば、従来製造が困難であったフィン付
きのセラミックス管を比較的容易に製造することが可能
となる。また、本発明のフィン付きセラミックス管は、
フィンが接合されていることにより、これを多管式熱交
換器の伝熱管として用いると、大きな伝熱面積が得ら
れ、熱交換効率を向上させることができる。As described above, according to the manufacturing method of the present invention, the tubular body which is the ceramics sintered body and the fin which is the ceramics unsintered body are combined and fired, and the difference in the firing shrinkage ratio between them is Is used for joining and integration.
According to the present manufacturing method, it becomes possible to relatively easily manufacture a ceramic tube with fins, which has been difficult to manufacture in the past. Further, the finned ceramics tube of the present invention,
Since the fins are joined to each other, when the fins are used as a heat transfer tube of a multi-tube heat exchanger, a large heat transfer area can be obtained and heat exchange efficiency can be improved.
【図１】本発明に係るフィン付きセラミックス管の製造
方法の一例を示す説明図である。FIG. 1 is an explanatory view showing an example of a method for manufacturing a finned ceramics tube according to the present invention.
【図２】本発明に係るフィン付きセラミックス管の一例
を示す斜視図である。FIG. 2 is a perspective view showing an example of a finned ceramics tube according to the present invention.
【図３】本発明に用いられるフィンの一例を示す図であ
り、(ａ)は平面図、(ｂ)は断面図である。3A and 3B are diagrams showing an example of fins used in the present invention, in which FIG. 3A is a plan view and FIG. 3B is a sectional view.
【図４】本発明に用いられるフィンの一例を示す断面図
である。FIG. 4 is a cross-sectional view showing an example of fins used in the present invention.
【図５】本発明に用いられるフィンの一例を示す断面図
である。FIG. 5 is a cross-sectional view showing an example of fins used in the present invention.
【図６】従来、セラミックス製多管式熱交換器の伝熱管
として用いられてきたセラミックス管を示す斜視図であ
る。FIG. 6 is a perspective view showing a ceramic tube conventionally used as a heat transfer tube of a ceramic multitubular heat exchanger.
２…管状体、４…フィン、６…枠体、８…溝、１０…
溝、１２…スペーサー棒2 ... Tubular body, 4 ... Fin, 6 ... Frame body, 8 ... Groove, 10 ...
Groove, 12 ... Spacer bar
Claims (3)
セラミックス未焼結体からなり、前記管状体を挿通する
ための貫通孔を有するリング状のフィンを、所定の間隔
で多数装着し、これを焼成することにより前記管状体と
フィンとの焼成収縮率の差を利用して、前記管状体とフ
ィンとを一体に接合固定してなることを特徴とするフィ
ン付きセラミックス管の製造方法。1. A tubular body made of a ceramics sintered body,
A large number of ring-shaped fins made of a ceramic unsintered body and having through-holes for inserting the tubular body are mounted at a predetermined interval, and the firing shrinkage ratio between the tubular body and the fins is obtained by firing the fins. The method for manufacturing a ceramic tube with fins, wherein the tubular body and the fins are integrally joined and fixed by utilizing the difference of the above.
大きく、１．５mmより小さくなるようにした請求項１記
載の製造方法。 【数１】 （式中、「フィンの焼成割掛け」とは、貫通孔に何も挿
通せず、焼成収縮が拘束無く進行する状態でフィンを焼
成した場合において、フィンの焼成前の寸法を焼成後の
寸法で除した値をいう。）2. The manufacturing method according to claim 1, wherein the value of the interference indicated by the following formula is set to be larger than 0 and smaller than 1.5 mm. [Equation 1] (In the formula, "firing firing of fins" means that the fins before firing are the dimensions after firing when the fins are fired in a state where nothing is inserted into the through hole and firing shrinkage proceeds without restriction. The value divided by.)
ックスからなるリング状のフィンが接合固定されている
ことを特徴とするフィン付きセラミックス管。3. A ceramic tube with fins, characterized in that a ring-shaped fin made of ceramics is bonded and fixed to a tubular body made of ceramics.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7697296A JPH09263458A (en) | 1996-03-29 | 1996-03-29 | Finned ceramic tube and its production |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7697296A JPH09263458A (en) | 1996-03-29 | 1996-03-29 | Finned ceramic tube and its production |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH09263458A true JPH09263458A (en) | 1997-10-07 |
Family
ID=13620708
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7697296A Withdrawn JPH09263458A (en) | 1996-03-29 | 1996-03-29 | Finned ceramic tube and its production |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH09263458A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006112777A (en) * | 2004-10-14 | 2006-04-27 | Nova Chem Internatl Sa | External ribbed furnace tube |
| WO2012102378A1 (en) * | 2011-01-28 | 2012-08-02 | 京セラ株式会社 | Silicon carbide assembly, heat transfer tube comprising same, and heat exchanger provided with said heat transfer tube |
-
1996
- 1996-03-29 JP JP7697296A patent/JPH09263458A/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006112777A (en) * | 2004-10-14 | 2006-04-27 | Nova Chem Internatl Sa | External ribbed furnace tube |
| WO2012102378A1 (en) * | 2011-01-28 | 2012-08-02 | 京セラ株式会社 | Silicon carbide assembly, heat transfer tube comprising same, and heat exchanger provided with said heat transfer tube |
| JP2013216500A (en) * | 2011-01-28 | 2013-10-24 | Kyocera Corp | Silicon carbide assembly, heat transfer tube comprising the same, and heat exchanger provided with the heat transfer tube |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20030603 |